add toast and update model (#3)

Signed-off-by: the-dagger <[email protected]>

Author: harshithdwivedi

.idea/caches/build_file_checksums.ser

@@ -5,6 +5,7 @@ import android.os.Bundle
 import android.support.design.widget.BottomSheetBehavior
 import android.support.v7.widget.LinearLayoutManager
 import android.view.View
+import android.widget.Toast
 import com.google.firebase.ml.vision.FirebaseVision
 import com.google.firebase.ml.vision.common.FirebaseVisionImage
 import com.google.firebase.ml.vision.face.FirebaseVisionFace
@@ -48,7 +49,7 @@ class FaceDetectionActivity : BaseCameraActivity() {
                     adapter.notifyDataSetChanged()
                 }
                 .addOnFailureListener {
-
+                    Toast.makeText(this, "Sorry, an error occurred", Toast.LENGTH_SHORT).show()
                 }
                 .addOnCompleteListener {
                     sheetBehavior.state = BottomSheetBehavior.STATE_EXPANDED